Monk's-Hood is a medieval mystery novel by Ellis Peters, set in December 1138. It is the third novel in The Cadfael Chronicles. It was first published in 1980 (1980 in literature).
It was adapted for television in 1994 by Central for ITV.
Gervase Bonel dies from monkshood oil put in his food. Brother Cadfael made the oil. Who used it as poison? Cadfael assesses the motives of Bonel's family and household staff, including his Welsh natural son and his stepson, and deals with Bonel's widow who was once Cadfael's sweetheart long ago. The sergeant views the case differently from Cadfael.
This novel received the Silver Dagger Award in 1980 from the UK's Crime Writers Association. The author was commended by one reviewer for her ability to draw characters who are distinctly medieval, "not modern men and women masquerading in medieval garb," while dealing with fine points of medieval Welsh law. Another reviewer missed the lively character of the second novel, Hugh Beringar, wishing him to be more involved in this plot, yet saying "Peters does wonders with the medieval scene and with complex character relationships."
Plot summary
In early December 1138, Abbot Heribert of Shrewsbury Abbey is summoned to a Legatine council in London and his authority is suspended. The Abbey's business is also postponed, with one exception: Gervase Bonel, who has ceded his manorial estate at Mallilie to the Abbey in return for a small house where his needs in retirement will be provided, is allowed to move his household before the charter is signed. All expect that Heribert or his successor will complete the agreement after the council.
Prior Robert is left in charge of the Abbey. He receives gifts meant for the Abbot, including a fat partridge which he shares with Bonel, having his cook send a portion with dinner. Bonel is taken ill immediately after eating it. Brother Cadfael the herbalist and Brother Edmund the infirmarer run to his aid but cannot save him. Cadfael recognises Bonel's widow as Richildis Vaughan, to whom he was informally betrothed over 40 years earlier. He realises that the sauce in which the partridge was served was poisoned by a liniment he made. Its active ingredient is monkshood (Wolfsbane), deadly if ingested.
The murder is reported to Shrewsbury Castle. Sheriff Prestcote sends the unsubtle Sergeant Will Warden to investigate. As Prior Robert ate the other half of the partridge without ill effects, suspicion falls on Bonel's household. Richildis was never alone with the partridge. Aelfric, who carried the dishes from the kitchen, bears a grudge as Bonel deprived him of free status and made him a villein. Neither the maid, Aldith, nor Meurig, an illegitimate son of Bonel who is apprenticed to Richildis' son-in-law master carpenter Martin Bellecote, have any apparent motive. Edwin Gurney, Richildis' son from her first marriage, was present at part of the meal, but stormed out after a quarrel before Bonel ate the partridge. He and Meurig had come separately from the Abbey's infirmary, where Meurig used the monkshood oil to massage his great uncle, the aged Brother Rhys. Edwin's motive for murdering Bonel is plain to the sergeant. Because the charter with the Abbey is not completed, Edwin will inherit Mallilie.
Warden fails to find Edwin. Late that night Edwin and his same-age nephew, Edwy Bellecote, meet Cadfael in his workshop. By pretending that Bonel was attacked with a sword or dagger, Cadfael establishes that Edwin does not know how Bonel died and is innocent of poisoning him. He disguises Edwin in a monk's habit and conceals him in one of the Abbey's barns. Cadfael suggests that Warden search for the vial which the murderer used to carry the oil. Warden reports that Edwin was seen to throw something glittery into the River Severn. Cadfael questions Edwin, who says that he threw a carved wooden reliquary, a gift intended for Bonel, into the river after their quarrel.
That night, Cadfael visits Richildis to ask if there are other legitimate heirs. If Edwin does not inherit, Mallilie would revert to Bonel's overlord. Richildis reminisces about her former relations with Cadfael. Brother Jerome, Prior Robert's sanctimonious clerk, is eavesdropping outside the door. At Chapter, Jerome betrays Cadfael's and Richildis' former relationship. Prior Robert forbids Cadfael, who is bound by his vow of obedience, to leave the Abbey's precincts.